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Dependence of the electric field and the conductivity in (a) and the emission intensity in (b) on the current density for the sample under excitation pulses with widths of 1.05 and and a repetition rate of .
(Color online) (a) The input pulses of current density of width and (b) the responding emission signals for the sample, which is biased in the SNDR region and in the Ohmic region .
Emission spectra from the sample under excitation of various current densities [ in (a) and , 2.16, 2.61, 3.07, and in (b)]. The current densities have been indicated in Fig. 1(b). The excitation pulses have a width of and a repetition rate of .
(Color online) A simplified picture of carrier excitation and relaxation processes according to the previous observations. Four different situations are presented: (a) at thermal equilibrium, (b) at , (c) at , and (d) at . Level represents the ground states, level represents the lowest excited states from which the transition to the ground states corresponds to the line, level represents a group of excited states from which the transition to the ground states corresponds to lines , , and , and level represents the band states and the excited states very close to the band edge.
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